Studio Pro Black Lined Copper Foil offers outstanding tack and remarkable resistance to temperature and weathering. They attach securely to glass edges and corners to provide a smooth, uniform solder bead. Unique easy pull plastic dispenser makes for trouble-free application and storage. Silver-lined copper foil has an internal silver core to match solder color. Use with Clear, non-opalescent glass and mirror. Standard 7/32" width good for most stained-glass projects. 36-yard roll.